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getOutput function: init

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This commit is contained in:
Nikolay Amiantov 2016-04-14 18:13:50 +03:00
parent 5f3987f44f
commit 7d3e75827b
1 changed files with 12 additions and 0 deletions
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12
lib/attrsets.nix
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@ -438,6 +438,18 @@ rec {
overrideExisting = old: new: overrideExisting = old: new:
old // listToAttrs (map (attr: nameValuePair attr (attrByPath [attr] old.${attr} new)) (attrNames old)); old // listToAttrs (map (attr: nameValuePair attr (attrByPath [attr] old.${attr} new)) (attrNames old));
/* Get a package output.
If no output is found, fallback to `.out` and then to the default.
Example:
getOutput "dev" pkgs.openssl
=> "/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-dev"
*/
getOutput = output: pkg:
if pkg.outputUnspecified or false
then pkg.${output} or pkg.out or pkg
else pkg;
/*** deprecated stuff ***/ /*** deprecated stuff ***/